package com.taylor.netty.demo;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;

/**
 * @Desc : netty 客户端
 * @Author ： taylor
 * @Date ：2021/6/28 20:48
 */
public class NettyClient {

    public static void main(String[] args) throws InterruptedException {
        //客户端需要一个事件循环组
        EventLoopGroup clientGroup = new NioEventLoopGroup();
        try {

            //创建客户端启动对象
            //注意客户端使用的不是 ServerBootstrap 而是 Bootstrap
            Bootstrap bootstrap = new Bootstrap();
            //设置相关参数
            //设置线程组
            bootstrap.group(clientGroup)
                    // 设置客户端通道的实现类(反射)
                    .channel(NioSocketChannel.class)
                    .handler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {
                            //加入自己的处理器
                            ch.pipeline().addLast(new NettyClientHandler());
                        }
                    });

            System.out.println("客户端 ok..");
            //启动客户端去连接服务器端
            //关于 ChannelFuture 要分析，涉及到netty的异步模型
            ChannelFuture channelFuture = bootstrap.connect("127.0.0.1", 8888).sync();
            //给关闭通道进行监听
            channelFuture.channel().closeFuture().sync();
        } finally {
            clientGroup.shutdownGracefully();
        }
    }
}
